Appliance for unwinding pack thread or the like



March 5, 1935. w. BEHRENDT 1,993,643

APPLIANCE FOR UNWINDING PACK THREAD OR THE LIKE Filed March '7, 1930 VI/BehrehJ Patented 'Mar. 5, 1935 UNITED STATE-S APPLIANCE FOR UNWINDINGPACK THREAD OR THELIKE Werner Behrendt, Application March 7',

I ugano, Switzerland 1930, Serial N- 434,114

In Switzerland Marchl3, 1929 2 Claims.

This invention relates to an appliance for unwinding pack thread, bymeans of which rolls or spools of pack thread of different lengths caneasily be unwound from the beginning rightto the end, and can be brakedwith a constant braking force. According to the invention the appliancecomprises a frame, a shaft rotatably supported in the frame and adaptedto hold the spool of pack thread, two discs mounted on the said shaft, apair of rotatably mounted cylinders bearing upon the peripheries of thediscs, a pulley at each end of each of the cylinders, two'endlesshelical springs, each passing around the two pulleys at one end of thecylinders, the said springs pressing the cylinders into contact with theperipheries of the discs and being adapted to exert thereby a constantbraking pressure to prevent excessive unwinding of the pack thread, andmeans for adjustingthe stress in the said springs.

The apparatus is preferably so constructed that it can be used either asa table appliance, a suspended appliance or an appliance fitted to awall, and will work equally well in any of these positions.

In the drawing I Figure 1 is a longitudinal sectional elevation of thefirst constructional form,

Figure 2 is a section on the line 2-2 of Figure 1.

To a base board 1 is secured a supporting frame consisting of two sidemembers 2 and 3 and a top bar 4. The side member 2 is formed with a slot5 open in the front for the suspension of one end of a carrying shaft 6,the other end of which is inserted in a hole in the side member 3. In acylindrical expansion of the slot 5is rotatably supported a sleeve 7provided with a longitudinal slot 6' and with a hand lever 8. Byrotating the sleeves 7 into the position shown in dot and dash lines inFigure 3 the slot 5 in the side member 2 can be closed, and the shaft 6thereby prevented from dropping out in any position of the apparatus.Pins 9 limit the deflection of the hand lever 8. A split pin 10 at thelefthand end and a stepped portion at the right hand end of the carryingshaft 6 prevent lateral displacement of the latter.

The shaft 6 has a prismatic centre portion 11, and its outer portions 12are provided with righthanded and left-handed screw-threads, uponwhich'there are screwed wing nuts 13. Between these nuts pressure discs16, which are formed with axial apertures and each equipped with a metalplate 14 provided with a hub 15, are mounted loose upon the shaft 6. Thediscs 16 have concave internal surfaces and may be of wood, Upon eachhub is mounted loose an exchangeable cone 17, over which the centralsleeve 18 of a spool of pack thread 19 fits. By tightening the nuts 13,the sleeve 18 is forced on to the cones 17, and the spool 19 is pressedbetween the discs 16, as a result of which, during the unwinding of thepack thread, the latter is prevented from slipping in between the spooland the discs.

The cones 1'7 enable spools with sleeves 18 of different diameters to begripped. It is also possible, by adjusting the discs 16, the cones 1'7and the nuts 13, to grip spools of different lengths.

To the top bar 4 is secured a guiding wire 20 for a thread guide 21,through the eye of which the pack thread leaving the spool runs. Asimi-' lar thread guide wire 20 and thread'guide 21 are also secured tothe lower parts of the frame members 2 and 3, in order also to enablethepackthread to be unwound from the under side of the spool if desired.

Each side member 2 and 3 is formed with two vertical slots 22 and 23 inthe same plane, in which the journals 24 of two loose brake cylinders 25bearing upon the peripheries of the discs 16 are adjustably guided. Theends of the cylinder spindles 24 carry rollers or pulleys 26. Round thepulleys on the same side is passed an endless helical spring 2'7, bywhich the cylinders 25 are pressed against the peripheries of the discs16 and thus exert a braking action upon the discs '16 as the pack threadis being pulled off, so that the unwinding of an excess of pack threadis prevented. Since the cylinders 25 rotate, the unwinding of the packthread takes place quite easily. It is obvious that the braking effectwill always be the same, whether the spool diameter is'great or small.Since the braking acts with considerable leverage it is very effectiveso that no excess pack thread comes unwound. If desired, the springtension may be made adjustable.

Each of the frame side members2 and 3 has on the inner side a recess 28for the reception of a razor blade 29 for cutting off the unwound packthread. The edge of this blade projects somewhat beyond an open marginalslot 30 in the side .member, so that the pack thread introduced into theslot 30 can easily be cut off by pressing it against the razor blade. Ina guide 31 on each of the side members 2 and 3 is slidably mounted amember 32 which holds the blade fast, and which is provided with amarginal notch.

The apparatus as a whole is preferably covered with a two-partprotective hood or cover 33, the two parts being adapted to be fastenedto one anotherand to the base plate -1 by means of a lug 34 and a springpawl 36 which engages in a recess 35 in the base board 1, is supportedon the cover, and can be actuated from the outside. The cover isprovided with slots 37 and 38 for the passage of the thread guide rods20, and leaves the parts of the side members 2 and 3 that receive thecutting blades 29 exposed.

The pressure discs 16 may alternatively be provided directly with screwthreads; in which, case special wing nuts 13 are omitted;

The lower thread guide wire may if desired be,

secured to the base board.

What I claim is:- V

1. In a device for unwinding thread; from a spool the combination of aframe, a shaft rotatably supported by the frame, two pressure discsrotatably mounted on the shaftzat, each;- end ofi the spool, means topress the pressure discs against the spool, two cylinders rotatably andslidably supported by the frame bearing on the periphery of the pressurediscs, pulleys at the ends of the two cylinders, endless helical springstrained around the pulleys to yieldably hold the cylinders in positionagainst the pressure discs to prevent excessive. unwinding of the, packthread.

2; A device as claimed in claim 1; in which the means for pressing thepressure discs against the spool is provided for by a shaft havingrighthanded and left-handed screw threads, two wing nutswhich arescrewedonto the shaft, and two pressure. discs provided with hubs in order togrip the, spool when thawing nuts are screwed toward the spool;

WERNER BEHRENDT.

